My experience growing up
on a vegetable farm in Western New York has taught me that
earlier sweet corn production can be achieved by using a
clear plastic mulch. The planting date can be 7 to 10 days
earlier than the normal planting date for your area.

The first step is to
plant the corn into rows thirty inches apart with eight to
ten inches between seeds. Next, you simply roll some clear
plastic mulch (available at most garden centers) over the
top of the seedbed, and bury the edges in small furrows.
Make sure there are small holes in the plastic to allow the
soil and plants to breath. The clear mulch acts as a
miniature greenhouse, keeping heat and moisture in the
ground. The corn will come up and should be allowed to grow
under the plastic until it is several inches (approximately
6 to 8) high. Then the plastic can be sliced down the middle
and carefully removed. Use of an early variety also aids in
early production.

There is a little risk
associated with growing corn under plastic. There is an
increased risk of seed deterioration in the soil, especially
if there is cool and cloudy wet weather. Believe it or not,
I have seen newly planted plastic sweet corn fields covered
by several inches of snow, and have enjoyed the corn
produced there several weeks later. With some luck, you too
can have the earliest sweet corn around!